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That's the area around a star where scientists believe water could exist, in liquid form, making a planet potentially habitable.

The new findings are being presented at a conference on Extreme Solar Systems in Wyoming, U.S., where 350 exoplanet experts are meeting.

This discovery was made by The High Accuracy Radial Velocity Planet Searcher (HARPS), which is installed at the European Southern Observatory's 11.8ft La Silla Observatory in Chile.

'The detection of HD 85512 b is far from the limit of HARPS, and demonstrates the possibility of discovering other super-Earths in the habitable zones around stars similar to the sun,' said University of Geneva astronomer Michel Mayor.

The European Southern Observatory, La Silla Paranal, Chile, South America

Super-Earths, which range from Earth's mass to worlds 10 times more massive, are of particular interest to planet-hunters because it's thought that they could be even more conducive to the development of life than our own planet.

One of the team members, Lisa Kaltenegger, of the Max Planck Institute for Astronomy and the Harvard Smithsonian Centre for Astrophysics, said the latest round of findings marked a new age in the search for habitable planets.

'We are actually entering an incredibly interesting time in our history,' she said.

When the search for extrasolar planets began more than 15 years ago, the telescopes used for the task could only detect giant planets like our own solar system's Jupiter. Since then, the techniques and tools used for the search have become much more sensitive.

HARPS can detect the slight gravitational wobble caused by planets as small as Earth, if they have incredibly close-in orbits.

HARPS' observations of 376 sunlike stars has led the team to conclude not only that more than half of such stars are surrounded by planets, but also that about 40 per cent of them have at least one planet less massive than Saturn.